Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Income Statement [Abstract]
Product	$ 96,300	$ 99,320	$ 182,015	$ 195,957
Licensing and services	10,160	0	13,042
Total Revenue	106,460	99,320	195,057	195,957
Costs and expenses:
Cost of product revenue	48,163	44,345	88,835	86,844
Cost of licensing and services revenue	171	0	264
Research and development	39,552	22,302	67,194	43,541
Selling, general and administrative	28,189	18,832	49,277	37,581
Acquisition related charges	3,270	0	21,468	0
Restructuring charges	4,068	3	8,962	14
Amortization of acquired intangible assets	8,941	737	11,883	1,474
Costs and expenses	132,354	86,219	247,883	169,454
(Loss) income from operations	(25,894)	13,101	(52,826)	26,503
Interest expense	(5,505)	(37)	(7,116)	(85)
Other (expense) income, net	(201)	943	(355)	1,300
(Loss) income before income taxes	(31,600)	14,007	(60,297)	27,718
Income tax expense	4,056	2,236	28,721	3,963
Net (loss) income	(35,656)	11,771	(89,018)	23,755
Less: Net loss attributable to noncontrolling interest	86	0	101	0
Net (loss) income attributable to common stockholders	$ (35,570)	$ 11,771	$ (88,917)	$ 23,755
Net (loss) income per share:
Basic (in dollars per share)	$ (0.30)	$ 0.10	$ (0.76)	$ 0.20
Diluted (in dollars per share)	$ (0.30)	$ 0.10	$ (0.76)	$ 0.20
Shares used in per share calculations:
Basic (in shares)	116,903	117,904	116,883	117,170
Diluted (in shares)	116,903	120,944	116,883	120,041